Square-footage calculator
Add the areas of multiple rectangular rooms, convert square feet and square metres, and estimate costs.
Square footage calculator
Combine rectangular rooms and project areas.
Material estimate only. Confirm pack sizes, minimum orders, local prices, and project requirements before buying. Prices exclude delivery and taxes.
How to use the square-footage calculator
- Choose metres or feet. Enter the length and width of your first rectangular area.
- Use Add another area for additional rooms or rectangles, up to 20. Remove unneeded rows, and make sure no portion of the space is counted twice.
- Optionally choose the supplier’s currency and enter a price per square metre or square foot, matching the selected system.
- Click Calculate square footage to see the combined area, equivalent units, number of areas, and optional area-based cost. This calculation does not add waste or round to material packages.
Frequently asked questions
Practical answers for this calculator. Select a question to read more.
How do I measure an L-shaped room?
Split it into two non-overlapping rectangles. Enter each as a separate area. The tool adds them together; do not measure the full outer rectangle and then add a section that is already inside it.
How do I enter feet and inches?
The imperial fields accept decimal feet. Convert the inch portion by dividing by 12: 10 ft 6 in becomes 10.5 ft, while 10 ft 3 in becomes 10.25 ft. Entering 10.6 means 10.6 feet, not 10 feet 6 inches.
Can I use feet for one room and metres for another?
Not in this calculator. All rows share the selected measurement system. Switching the system converts the existing room dimensions. Convert a measurement to the current system before entering it, or switch the whole form first.
Does this include waste or work out how many flooring boxes I need?
No. It reports measured rectangular area and an optional area-based cost. Use the flooring calculator when you need a waste allowance and whole-box quantities. The square-footage total is not automatically transferred into another calculator.
Can I use the total as the official floor area of a property?
Not without checking the applicable measurement rules and obtaining any required professional assessment. Rules for walls, stairs, low ceilings, balconies, and other spaces can differ. This tool adds rectangles; it does not certify saleable, habitable, carpet, or legally reportable floor area.
For more detail, read our methodology and disclaimer. Found a problem? Contact CalHomeGo.
Calculations run in your browser. Optional currency conversion contacts Frankfurter for rates; your measurements and cost amounts are not sent. Reference rates are not bank quotes.